import React, { forwardRef } from 'react';
import { Slot } from '@radix-ui/react-slot';
import { cva } from 'class-variance-authority';

// 按钮变体样式
const buttonVariants = cva(
  'inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50',
  {
    variants: {
      variant: {
        default: 'bg-primary text-primary-foreground hover:bg-primary/90',
        destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/90',
        outline: 'border border-input bg-background hover:bg-accent hover:text-accent-foreground',
        secondary: 'bg-secondary text-secondary-foreground hover:bg-secondary/80',
        ghost: 'hover:bg-accent hover:text-accent-foreground',
        link: 'text-primary underline-offset-4 hover:underline',
      },
      size: {
        default: 'h-10 px-4 py-2',
        sm: 'h-9 rounded-md px-3',
        lg: 'h-11 rounded-md px-8',
        icon: 'h-10 w-10',
      },
    },
    defaultVariants: {
      variant: 'default',
      size: 'default',
    },
  }
);

// 按钮Props类型定义
interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: 'default' | 'destructive' | 'outline' | 'secondary' | 'ghost' | 'link';
  size?: 'default' | 'sm' | 'lg' | 'icon';
  asChild?: boolean;
}

// 按钮组件
const Button = forwardRef<HTMLButtonElement, ButtonProps>(({
  variant, 
  size, 
  asChild = false,
  ...props
}, ref) => {
  const Comp = asChild ? Slot : 'button';
  return (
    <Comp
      className={buttonVariants({ variant, size })} 
      ref={ref}
      {...props}
    />
  );
});

Button.displayName = 'Button';

export { Button, buttonVariants };